Shell of an electronic device



FIG. 1 is a front elevational view of shell of an electronic device;

FIG. 2 is a front perspective view of shell of an electronic device; and,

FIG. 3 is a right side view of shell of an electronic device.

The broken line showing of the remainder of the electronic device is for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a shell of an electronic device, as shown and described. 